: Mackenzie Astin as Thomas Yates and Zack Weinstein.

: Examining the childhood stressors and environmental factors that contribute to a killer's development. Production Highlights Director : Felix Alcala. Writers : Breen Frazier.

is the 22nd episode of the seventh season of the long-running police procedural series Criminal Minds . Aired in 2012, it is widely regarded by fans as a unique "teaching" episode that explores the history of the Behavioral Analysis Unit (BAU) and one of its longest-running cases. Episode Overview